Engineering Documents · Free Template
Instrument Air Header and Take Off Schedule Template
List every instrument air consumer by header and take off valve, with steady consumption. The sheet totals air use and adds a design margin to size headers and compressors.
Excel (.xlsx)Printable PDFFilled exampleFree, no sign up
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- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- 6 built in formulas
- A4 landscape print setup
- Works in Excel, Google Sheets and LibreOffice
Preview of the Filled Example
This is the Example sheet from the download, so you can see exactly how the completed instrument air header and take off schedule looks.
AreaArea 300
Header pressure (bar g)7
Design margin (%)30
RevisionA
Take offs
| No | Header | Take off | Instrument tag | Consumer | Type | Steady use (Nm³/h) | Valve size | Tube size | Status | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | IAH 301 | TO 01 | FV 3101 | Feed control valve | Positioner | 0.60 | 1/2" | 10 mm | Used | |
| 2 | IAH 301 | TO 02 | XV 3102 | Shutdown valve | On off actuator | 0.10 | 1/2" | 10 mm | Used | |
| 3 | IAH 301 | TO 03 | AT 3103 | Analyser purge | Purge | 1.50 | 1/2" | 10 mm | Used | |
| 4 | IAH 301 | TO 04 | Spare | Spare | 0.00 | 1/2" | Spare |
Total steady use (Nm³/h):2.20 · Design use with margin (Nm³/h):2.86 · Spare take offs:1
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About the Instrument Air Header and Take Off Schedule
An air header schedule keeps instrument air distribution organised: every consumer has a take off, spares are visible, and total demand is known for sizing headers, dryers and compressors.
How to fill in this template
- List each header and its take off valves.
- Assign consumers and their steady air use from vendor data.
- Mark spare take offs.
- Read the total and design use with margin.
- Use totals to check header size and compressor capacity.
What the formulas do
- Total = sum of steady consumption.
- Design use = total × (1 + margin).
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Frequently Asked Questions
What steady consumption does a positioner have?
Typically a fraction of a Nm³/h; use vendor data, since it varies widely.
Should transient demand be included?
Size separately for valves that stroke together, such as shutdown groups.
How many spares?
Commonly about 20 % per header.
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